New feature: Added ASCII map

ASCII config map for replacement special and/or accented UTF-8
characters by ASCII-7 "equivalents"
New feature: Added UTF8::toAscii
Updated feature: Used simple config for str_replace faster than preg_replace
Fixed issue: Replced preg_replace by str_replace, removed transliterate_to_ascii
Updated feature: Replaced transliterate_to_ascii by toAscii
Updated feature: Removed not needed file
Updated feature: Replaced transliterate_to_ascii by toAscii
Updated feature: Removed Text::convert_accented_characters
Merge pull request #721 from sergeyklay/feature-utf

Feature utf